Dear sage-support
the following plot works
x,y=var('x,y')
contour_plot(sqrt(1-(x^2+y)^2),(x,-2,2),(y,-2,0), fill=False,
labels=True)
but the following not:
x,y=var('x,y')
contour_plot(ln(1-(x^2+y)^2),(x,-2,2),(y,-2,0), fill=False,
labels=True)
I get
Traceback (click to the left of this block for traceback)
...
ValueError: math domain error
How can I plot the second picture? Thanks.
Robert Marik
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